Hmmmmm,
I've keep bullfrogs in the house from time to time.
Small ones.

There are these really neat set ups you can buy that
provide a 'pool', water fall, 'land'. Also filters the water.
I've done homemade versions of these by putting a pane
of plexiglass in the aquarium to divide it into land and pond.
Planted houseplants on the land side to provide cover.

Fed them crickets, mealworms and you could add feeder
fish in the aquarium side.You can even buy special cricket
food so the crickets are nutritiously sound. Then you might
set up a cricket habitat.... (messy but kind of fun to have
them singing in the house in the winter, even though they
are doomed :-(

kathy :-)